Checking The Direction Of Rotation; Starting Up The Product; Product Introduction - Grundfos Unilift AP12 Installation And Operating Instructions Manual

Make sure that the product is suitable for the supply
voltage and frequency available at the installation
site. Voltage and frequency are marked on the pump
nameplate.
The pump must be connected to an external main
switch. If the pump is not installed close to the
switch, the switch must be of a lockable type.
Three-phase pumps must be connected to an
external motor-protective circuit breaker with
differential release. The rated current of the motor-
protective circuit breaker must correspond to the
electrical data marked on the pump nameplate.
If a level switch is connected to a three-phase pump,
the motor-protective circuit breaker must be
magnetically operated.
Single-phase pumps incorporate thermal overload
protection and require no additional motor
protection.
If the motor is overloaded, it will stop
automatically. When the motor has cooled
to normal temperature, it restarts
automatically.

4.1 Checking the direction of rotation

Three-phase pumps only
Check the direction of rotation every time the pump
is connected to a new installation.
1. Position the pump so that you can observe the
impeller.
2. Start the pump for a short period.
3. Observe the rotation of the impeller. The correct
direction of rotation is indicated by an arrow on
the inlet strainer (clockwise when seen from the
bottom). If the impeller rotates in the wrong
direction, reverse the direction of rotation by
interchanging two of the phases to the motor.
If the pump is connected to a pipe system, check the
direction of rotation in this way:
1. Start the pump and check the quantity of water or
the pressure.
2. Stop the pump and interchange two of the
phases to the motor.
3. Start the pump and check the quantity of water or
the pressure.
4. Stop the pump.
Compare the results taken under points 1 and 3. The
largest quantity of water indicates the correct
direction of rotation.
6

5. Starting up the product

DANGER
Electric shock
Death or serious personal injury
- Do not use the pump in swimming
pools, garden ponds or similar places if
there are people in the water.
The pump may be run briefly to check the
direction of rotation without being
submerged in the pumped liquid.
1. Before starting the pump, check that the inlet
strainer is fitted to the pump and submerged in
the pumped liquid.
2. Open the isolating valve, if fitted, and check the
level switch setting.

6. Product introduction

Outlet
Pump
sleeve
Inlet
strainer
Fig. 5 Unilift AP
Handle with
clamp
Level
switch